Optical Transceiver Shield Structure for EMI Leakage Suppression
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Solution Overview
Problem
Optical transceivers generate undesired electromagnetic waves that leak through the optical connector due to the lack of effective shielding, particularly in high-speed communication systems like 400 Gbit/s, which is challenging to suppress without compromising the flexibility and assembly of optical fibers.
Innovation Solution
An optical transceiver design incorporating a metal housing with an attenuation mechanism, featuring conductive posts or plates that form a structured interior space to impede electromagnetic wave propagation, allowing optical fibers to pass through while maintaining flexibility and assembly ease.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an electromagnetic wave shield is placed between the photoelectric device and the optical connector, then electromagnetic wave leakage is suppressed, but the optical fiber connection becomes difficult
Solution Approach 1:
The patent transitions from a 2D planar shield to a 3D mesh structure with conductive wires arranged in multiple directions (horizontal, vertical, and diagonal). This three-dimensional configuration creates electromagnetic shielding through volumetric coverage while maintaining open spaces that allow optical fibers to pass through and connect the photoelectric device to the optical connector without obstruction
Solution Approach 2:
The mesh structure functions as a porous shielding material where conductive wires are arranged with intentional gaps and spacing. This porous configuration allows optical fibers to penetrate through the shield structure freely while the conductive wire network maintains electromagnetic shielding effectiveness by reflecting and absorbing electromagnetic waves
2Object-affected harmful factors
If a metal housing with continuous conductive surface is used, then electromagnetic wave leakage is suppressed, but the interior space for optical fiber becomes limited
Solution Approach 1:
The continuous conductive surface is segmented into discrete conductive wires arranged in a mesh pattern. This segmentation creates a three-dimensional shield structure that provides electromagnetic shielding through the distributed conductive network while leaving substantial intermediate space between the wires for optical fiber routing and connection
Solution Approach 2:
The mesh structure acts as a porous shielding medium where conductive wires are spaced apart to form a three-dimensional network. This porous configuration reduces the volume occupied by the shield itself while maintaining shielding effectiveness, thereby increasing the available intermediate space for optical fiber placement
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The attenuation mechanism effectively reduces electromagnetic wave leakage by up to 60 dB, ensuring compliance with electromagnetic interference regulations and flexible fiber placement.
Implementation Method 1
an attenuation mechanism capable of attenuating the electromagnetic waves in an intermediate space, through which the optical fiber passes, of the interior space
Implementation Method 2
the interior space being surrounded with a conductive surface from every direction perpendicular to the first direction
Data Source
AI summary
An optical transceiver includes an attenuation mechanism capable of attenuating the electromagnetic waves in an intermediate space of the interior space. The interior space is continuous in a first direction between the photoelectric device and the optical connector, the interior space being surrounded with a conductive surface from every direction perpendicular to the first direction. The attenuation mechanism is a post structure including some conductive posts electrically continuous to the conductive surface, the conductive posts extending in a second direction perpendicular to the first direction, the conductive posts being arranged at some points in a plan view along the second direction, the points being at vertices of some quadrangles, adjacent quadrangles of which share one side with each other, the quadrangles being arranged in the first direction, the optical fiber passing through at least one adjacent pair of the quadrangles in the first direction.